This is what I mean tinkering today, so I got my multimeter a unity it’s a bit of a cheapy, but it does meet just fine and I’ve been doing stuff. With this, where you’ve got an Arduino, you know a servo motor and a little board here. So this little board here I mean it – is just breaking out Arduino pins to the servo and also a separate battery supply for the server. Now I did this originally because I want to work out how I can use a software PWM to control a servo motor because, as I understand it, the breakout board I have for the the Wi Fi chip, which has its own GPIO s. Doesn’T have GPIO s with the only single pwm pin, but there are two pins on it, which is software GPIO, simple, onoff and I’m, wondering perhaps I could pulse them fast enough, using Hardware timers to control two servos. Ultimately, two continuous rotation servos. So this is just a simple Arduino board and then a simple board here when breaking out two of the pins and initially just to make sure the servos work, and so I could test see if any of them I had were continuous rotation. I thought I had some, I didn’t find any in my box and so just pins 9 and 10, which are oddly PWM split out to these, with some three pin headers connected to connect the servo and your node is here, and this R bring closer to the Camera, so you can see there are two diodes here now these two diodes are so actually I could power the Arduino from the batteries instead of from a USB port, but I can independently power it.
I got interested and that really just dessert out of there. So I could demonstrate it away from the thing and when I go to the Wi Fi chip I’ll be using a 3 volt regulator. Now the Arduino no runs on 5 volts or there abouts. Actually, the three to eight on board is a little bit voltage tolerant. So anywhere between about four point, six, four point: seven and five point: two volts is probably good enough and then I’ve got this battery box, which is four AAS choose about six volts I mean give or take obviously depending upon the age of the batteries, but those Give six volts and you can’t, put six volts through three to eight. I think you’d probably destroy it. So two diode drops each diode drops about not 0.6 volts, at least it does when the current is high enough. That then means with two naught point: six volt drops I’ve got a one point, two volt drop, which will bring this voltage down to about four point: eight volts. Now what I did earlier was. I sat named and went through some of the calculations of my little one, Elena who’s, just learning to add and showed how you add batteries and how you can add. Diode drops. I also then went and run the batteries with the multimeter through these two diode drops, and the first thing I did was instead of this Arduino being here, because I didn’t want to risk destroy my Arduino board.
I used a small resistor, so I’ll just go into a robot cupboard and I should have a resistor suitable here somewhere that I used earlier. So this is a 330 ohm resistor and that’ll give a reasonable enough amount. I didn’t write down the calculations. This will probably produce a slightly smaller current, but if it’s big enough to drive these so then they give that 1.2 volt drop across them. That’Ll do so let’s just take away the Arduino power and I’ll just pop in this resistor going across from this ground. Over here to the bottom, diode drop there. Now, if you don’t, have this resistor, if the only load you have it across is the multimeter you’ll see virtually no diode drop and nothing at all across it. So first thing is I’ve got this set to the 20 volt range. Tell you what let’s use a tilting, bail and let’s have that facing the camera. Okay, so let’s connect the batteries I will take out so go for now, because it’s, just clothing, review and and these batteries are giving six point two six volts that’s close enough. Okay and if I connect those so that’s now going straight across this resistor and I’m, going to connect that the wrong way up let’s get this the right way up. So we should see four point: seven volts, okay, it’s close to four point: eight volts it’s good enough and that will run the Arduino okay. And if I go halfway up five point, four seven and we go across to here and we’re at our six five.
Six point: one: seven: okay, there’s a bit of a current drains, have probably very slightly lower voltage in the open voltage. So I take away the resistor add back in the Aveeno board and there yeah it’s powering up. You can see the lights lighting or working nicely. If we hit the reset, we should see it flashing away, and then I stuck on a bit of simple code just to test sweeping the servos, because I just wanted to see that this servo was functional and then we have it. So the servo is being powered by the board and the Arduino is being powered by the board. So six bolts, two diodes. Okay, these are one n400, seven diodes they’re not getting even slightly warm there’s, actually not an awful lot of current going through the mirror. Each dropping or were sane or point 6 volts. Okay, so talking naught point 6 volts around about 78 million or less because they’re not powering this. They wrote it’s only the diode drop for the arduino that works out to be a relatively small number and we’re talking, and you know maybe 3040 milliwatts per diode, so that’s what I’ve been working on tonight. Thank you very much.
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